A switching regulator is configured as a fixed-voltage regulator and contains a voltage divider. The voltage divider is supplied with a voltage signal available from a regulator output via a first connection. The voltage divider feds an output signal to the driver circuit functioning as a regulating variable that is compared to a reference voltage. The switching regulator further contains a monitoring device which impinges the driver circuit with a voltage signal exceeding the reference voltage as a new regulating variable depending on the voltage signal applied to the first connection.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A switching regulator configuration ( 1 ) functioning as a fixed voltage regulator, comprising: a regulator output ( 2 ) outputting a voltage signal; a terminal (V) connected to said regulator output ( 2 ) and receiving the voltage signal; a voltage divider ( 40 ) coupled to said terminal (V) and receiving the voltage signal, said voltage divider ( 40 ) outputting an output signal functioning as a first regulation variable (v 1 ); a driver circuit ( 35 , 31 ) coupled to said voltage divider and receiving the first regulation variable, the driver circuit evaluating the first regulation variable with a reference voltage(vref); and a monitoring circuit ( 50 ) coupled to said driver circuit ( 35 , 31 ), said monitoring circuit ( 50 ) applying to said driver circuit ( 35 , 31 ), in dependence on the voltage signal present at said terminal (V), a further voltage signal exceeding the reference voltage (vref) and functioning as a second regulation variable (v 2 ).
2. The switching regulator according to claim 1 , wherein the voltage signal present at said regulator output is fed directly as the second regulation variable to said driver circuit.
3. The switching regulator according to claim 1 , further comprising: a further terminal; and a controllable switchover device connected to said driver circuit and set up to be able to feed to said driver circuit either the output signal of said voltage divider or a signal present at said further terminal.
4. The switching regulator according to claim 3 , wherein the voltage signal present at said regulator output is present at said further terminal.
5. The switching regulator according to claim 4 , wherein said monitoring circuit has a comparison device to which the voltages present at said terminal and said further terminal are fed as input variables to said comparison device.
6. The switching regulator according to claim 5 , wherein said comparison device generates an output signal received by and used as a control signal in said controllable switchover device.
7. The switching regulator according to claim 4 , wherein said controllable switchover device can be controlled by the voltage signal present at said regulator output, and that a signal present at said further terminal is fed to said driver circuit.
8. The switching regulator according to claim 6 , wherein said monitoring circuit has a logical gate which logically combines the output signal output by said comparison device and a further control signal.
9. The switching regulator according to claim 1 , wherein said driver circuit has an operational amplifier circuit and an output driver to control a step-down converter, said operational amplifier circuit connected to said output driver via a node point, said monitoring circuit connected between said node point and said terminal.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
June 23, 2005
September 15, 2009
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